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Sir
Use etherchannel command or smit etherchannel and create network interface backup here easily .
After you create etherchannel now you can this etherchannel for create SEA by command or by HMC .
when you want create vlan taging for adapter ... use smit vlan ....it's easy

Create etherchannel with this 2 adapters (one as primary and backup) ,Your
done with NIB.Similarly you can have load balance for other lpars by making
your virtual adapters primaryin etherchannel,so some use vio1 as primary
and some uses vio2 as primary.

Vlan tagging (Basic setup - Needs SEA failover,configured)

Need to be enabled in switch end.On vios for the virtual adapter in SEA
should be

*Select : 801.2q compatible adapter*

*Check the box "access external network".*

*Give the virtual adapter a low trunk priority. EX: "1"(vios1 )
*

*Give the virtual adapter a low trunk priority. EX: "2" (Vios2)
*

to the adapter.Configure your clients virtual adapter and give the vlan id
as tagged numbers you used in vios.(This depends which vlan your client
should communicate).